EP0347847B1 - Dispositif d'usinage fin automatique et sans centre pour éléments à surface de révolution symétrique dans une machine fonctionnant en continu - Google Patents

Dispositif d'usinage fin automatique et sans centre pour éléments à surface de révolution symétrique dans une machine fonctionnant en continu Download PDF

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Publication number
EP0347847B1
EP0347847B1 EP89111223A EP89111223A EP0347847B1 EP 0347847 B1 EP0347847 B1 EP 0347847B1 EP 89111223 A EP89111223 A EP 89111223A EP 89111223 A EP89111223 A EP 89111223A EP 0347847 B1 EP0347847 B1 EP 0347847B1
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EP
European Patent Office
Prior art keywords
finishing
measuring device
computer means
computer
acceleration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89111223A
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German (de)
English (en)
Other versions
EP0347847A2 (fr
EP0347847A3 (en
Inventor
Norbert Dr. Klotz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Supfina Maschinenfabrik Hentzen GmbH and Co KG
Original Assignee
Supfina Maschinenfabrik Hentzen GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE8807980U external-priority patent/DE8807980U1/de
Priority claimed from DE8812160U external-priority patent/DE8812160U1/de
Application filed by Supfina Maschinenfabrik Hentzen GmbH and Co KG filed Critical Supfina Maschinenfabrik Hentzen GmbH and Co KG
Publication of EP0347847A2 publication Critical patent/EP0347847A2/fr
Publication of EP0347847A3 publication Critical patent/EP0347847A3/de
Application granted granted Critical
Publication of EP0347847B1 publication Critical patent/EP0347847B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

Definitions

  • the invention relates to an automatic centerless fine machining device for surface-rotationally symmetrical bodies in a continuous machine with a plurality of successive machining stations with individually deliverable finishing stones which are excited to vibrate via a common drive.
  • Such fine machining machines are used to machine outer cylindrical surfaces, to improve the surface quality, to precisely form the radius of curvature and to set the exact size of these workpieces.
  • the starting point is a microfinishing machine as described in US Pat. No. 4,558,537.
  • the workpieces to be machined are centered by two drive rollers and rotated by rotating these rollers in the same direction.
  • Several processing stations are arranged side by side above the rollers and workpieces.
  • Each processing station consists of a finishing stone, which is held by a stone holder.
  • the stone holder is connected to a piston rod of a control cylinder. With this cylinder, the finishing stone can be driven up to the workpiece to be machined or moved back by it.
  • the contact pressure of the finishing stones can be changed via a control in order to be able to adapt to changing surfaces and to compensate for the wear of the finishing stones.
  • the finishing stones are also set in oscillating movements in the direction of the drive roller axes.
  • the vibration amplitude of the tool should be kept constant, because this has the greatest influence.
  • DE-28 14 761 describes a complex vibration method for polishing limited surfaces and the drive devices for generating the vibrations.
  • the vibration limits are checked manually or via electrical limit switches.
  • DE-30 07 314 describes a method and a device for machining bearing surfaces, wherein the oscillating movement of the grindstones is also controlled via electrical or mechanical limit switches.
  • DE-31 33 246 describes a machine tool with non-stop travel limitation, a voltage being formed via potentiometers which corresponds to the current location of the tool. The tool position is then limited by comparing it with specified voltage limit values.
  • the object of the present invention is therefore to make available an automatic device with a corresponding circuit which enables precise control, in particular keeping the oscillation amplitude of the movement of finishing stones constant.
  • the actual movement of the finishing stones is measured and compared with a predetermined target value.
  • a common cross connection of the finishing stones, via which the finishing stones are excited to vibrate together has a corresponding measuring sensor for recording the movement.
  • the movement of the finishing stones can be determined, for example, using a displacement sensor or accelerometer. Its measured values are displayed for control purposes and fed to a process computer for evaluation. These actual values are fed to the process computer via measuring lines.
  • the process computer receives the associated setpoints of these measured variables via a further line.
  • the process computer compares these values and controls the swinging motion of the finishing stones according to the result.
  • the output of the process computer is connected to an adjustable pressure valve via a control line. This pressure valve is located in a pressure supply line of a pneumatic cylinder, which is used to drive the finishing stones.
  • the piston rod of this cylinder is connected to the common cross connection of the finishing stones.
  • FIGS. 1 and 2 show the central part of a centerless continuous superfinishing machine.
  • the machine has an oscillating conveyor 12, via which individual workpieces 10 to be machined are fed continuously in the direction of the arrow to the machine.
  • the rollers are essentially cylindrical, which are fed from a pre-processing station, for example a grinding machine.
  • these workpieces 10 receive their final surface quality on the cylindrical outer surface by exposing them in succession to several processing stations in the machine.
  • a second vibratory conveyor 18 is used for the removal (in the direction of the arrow) of the finally machined workpieces 10.
  • Two drive rollers 14 and 16 are used for centerless storage and for driving the workpieces 10 during machining.
  • the rollers 14 and 16 rotate in the same direction and thus set the workpieces 10 in rotation.
  • the axes of the rollers 14 and 16 slightly increase their distance along the path, causing the workpieces 10 to move forward along the rollers.
  • seven successive processing stations A, B, C, D, E, F, G are arranged above the rollers.
  • Each processing station has a finishing stone 20.
  • the finishing stone 20 is held by a stone holder 22.
  • the stone holder 22 is connected to an infeed rod 24 which can be moved via an infeed cylinder 26.
  • each finishing stone 20 can be moved to and from the workpiece 10, regardless of the finishing stones 20 of the other processing stations. In this way, different dimensions of the finishing stones 20 are compensated for or different machining operations are possible.
  • the individual processing stations are connected to one another via a rod 30 in the conveying direction of the rollers 14 and 16.
  • the rod 30 is connected on one side to a piston 32. With the aid of this piston 32, the rod 30 can be set into a rapid oscillating movement in the conveying direction of the rollers 14 and 16. At the same time, this leads to a reciprocating drive movement of the finishing stones 20.
  • the piston 32 is actuated pneumatically, for which purpose a compressed air supply line 34 is provided, which is connected to a pressure generator 38 via a control valve 36 and a further compressed air line 40.
  • the rod 30 is also provided with a movement sensor 50 for measuring the movement of the rod 30 and thus also the finishing stones 20.
  • a displacement sensor is provided as the movement sensor 50, with which the oscillation amplitude and the frequency of the movement of the finishing stones 20 are determined.
  • Resistance encoders or inductive encoders can be used as distance meters.
  • the odometer 50 Via a measuring line 90, the odometer 50 is connected to a display device 92 for displaying the amplitude and frequency of the vibration and further to a process computer 80.
  • the process computer 80 compares the actual values of the amplitude and frequency of the rod 30 supplied to it via the line 90 with the nominal values of amplitude and frequency supplied to it via a line 82.
  • the process computer 80 is connected to the control valve 36 via an output line 84. Depending on the differences between the actual and target values of the amplitude and frequency of the movement of the rod 30, the process computer 80 controls the pressure in the piston 32 and thus the vibration amplitude of the finishing stones 20 via the servo valve 36.
  • an accelerometer is provided as the motion sensor 50, with which the acceleration and the frequency of the movement of the rod 30 and thus of the finishing stones 20 are determined.
  • solder sensors or inertial sensors with capacitive, inductive or piezoelectric transducers can be used as accelerometers.
  • the acceleration sensor 50 Via a measuring line 52, the acceleration sensor 50 is connected with a wire 54 to a display device 56 which serves to display the acceleration.
  • the acceleration sensor 50 is connected to a further display device 60, which is used to display the frequency of the movement of the rod 30.
  • Both wires 54 and 58 are connected to an integrator 62. Its output is connected via a line 64 to a further display device 66 which serves to display the speed of movement of the rod 30.
  • Line 64 is also connected to a second integrator 68. Its exit is with a Line 70 connected to a display device 72, which serves to display the movement distance of the rod 30.
  • the line 70 is also connected to a process computer 80.
  • the wire 58 of the accelerometer 50 is also connected to the process computer 80 via a line 74.
  • the process computer 80 compares the actual values of the acceleration and the frequency of the rod 30 supplied to it via the lines 70 and 74 with the nominal values of acceleration and frequency supplied to it via a line 82.
  • the process computer 80 is connected to the control valve 36 via an output line 84. Depending on the differences between the actual and target values of the acceleration and frequency of the movement of the rod 30, the process computer 80 controls the pressure in the piston 32 and thus the vibration amplitude of the finishing stones 20 via the servo valve 36.
  • the mode of operation of the present invention will be explained in more detail with reference to embodiment 2 according to FIG. 2:
  • the object of the invention during the machining of workpieces in a centerless continuous machine to control the vibration amplitude of all machining stations and thus the oscillating movement of the finishing stones 20 on the machining surface of the workpieces 10, and to react to the vibration amplitude damping influences is first achieved in that the accelerometer 50 responds to each acceleration. It emits an electrical signal x ist proportional to the second derivative of the actual path. This signal is can be viewed in two ways. The actual acceleration in m / s2 is displayed on the display device 56. Any deviation from the target acceleration can thus be read and recognized.
  • the vibration is represented per time unit.
  • the speed is obtained as the first integration stage from the acceleration as an electrical signal x and made readable on the display device 66.
  • the same electrical signal x is sent to the second integrator 68 fed.
  • an electrical signal x for the maximum path or the processing distance is determined from the speed x and both made visible on the display device 72 and fed to the process computer 80 as an actual value for the movement amplitude.
  • the individual display devices 56, 60, 66 and 72 mentioned above are not individual devices, but rather displays which are optionally displayed on a display device already present on the machine, for example a central screen, on which the setpoints for setting up the machine or all are also shown other operating purposes are made visible, can be activated.
  • the possibility of reading the switchable values for the acceleration, the frequency, the speed and the amplitude represents a control option for the operator, but is not sufficient for automatic readjustment in the sense of keeping the amplitude constant.
  • the electrical quantities obtained and processed in the example shown for the frequency f are fed to the process computer 80 via the line 74 and the path x via the line 70.
  • a comparison is made with the nominal value for the amplitude supplied via line 82. Any deviation between a setpoint and a determined actual value x leads to an electrical control signal ⁇ U in the control line 84 at the output to the control valve 36.
  • ⁇ U there is a pressure change ⁇ p in the compressed air supply line 34 to the pneumatic drive 34 for the oscillating movement the finishing stones 20.
  • a variant not shown is that the process computer 80 also the actual values of the speed ⁇ or the acceleration are fed directly, while corresponding setpoint values are entered instead of or in addition to the amplitude setpoint.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Control Of Machine Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (11)

  1. Dispositif automatique de superfinition sans centres pour des corps présentant une surface extérieure à symétrie de révolution, dans une machine d'usinage en continu présentant plusieurs postes d'usinage consécutifs (A, B, C, ...) équipés de blocs de finition individuellement positionnables (20), qui sont mis en oscillation par un entraînement commun (32), caractérisé en ce que l'entraînement commun en oscillation (32) est relié par un élément transversal de liaison (30) à tous les éléments entraînés (20 à 26), et à un appareil enregistreur (50), destiné à enregistrer le mouvement oscillant des blocs de finition (20) et dont la sortie électrique est reliée à un calculateur de processus (80), qui reçoit une valeur de consigne par une ligne (82) et dont la sortie est appliquée à un organe de commande réglable (36), relié en série à l'entraînement en oscillation (32).
  2. Dispositif de superfinition selon la revendication 1, caractérisé en ce que l'appareil enregistreur (50) destiné à enregistrer le mouvement oscillant est un capteur d'accélération dont la sortie électrique est reliée au calculateur de processus (80) par l'intermédiaire d'intégrateurs (62, 68).
  3. Dispositif de superfinition selon la revendication 1, caractérisé en ce que l'appareil enregistreur (50) destiné à enregistrer le mouvement oscillant est un capteur de déplacement dont la sortie électrique est directement reliée au calculateur de processus (80).
  4. Dispositif de superfinition selon la revendication 3, caractérisé en ce qu'un afficheur (92), destiné à afficher l'amplitude de vibration, est intercalé entre le capteur de déplacement (50) et le calculateur de processus (80).
  5. Dispositif de superfinition selon la revendication 2, caractérisé en ce que des lignes, qui mènent à des afficheurs de visualisation (56, 60, 66, 72), partent en dérivation entre le capteur d'accélération (50) et le calculateur de processus (80).
  6. Dispositif de superfinition selon la revendication 2 ou 5, caractérisé en ce qu'une ligne directe (74) mène du capteur d'accélération (50) au calculateur de processus (80) pour transmettre la fréquence d'oscillation.
  7. Dispositif de superfinition selon la revendication 2, 5 ou 6, caractérisé en ce que deux étages d'intégration (62, 68) sont intercalés dans une ligne (52, 54, 64, 70) destinée à transmettre l'amplitude d'oscillation du capteur d'accélération (50) au calculateur de processus (80).
  8. Dispositif de superfinition selon la revendication 2, 5, 6 ou 7, caractérisé en ce que les dérivations pour les afficheurs (56, 60, 66, 72) partent aux endroits suivants des lignes de liaison (52, 54, 58, 64, 70, 74) entre le capteur d'accélération (50) et le calculateur de processus (80):
    a) sur la liaison directe (52, 58, 74) menant du capteur d'accélération (50) au calculateur de processus (80)
    b) avant le premier étage d'intégration (62)
    c) avant le second étage d'intégration (68)
    d) après le second étage d'intégration (68).
  9. Dispositif de superfinition selon l'une quelconque des revendications précédentes, caractérisé en ce que l'organe de commande réglable (36) est une servo-valve agencée dans une conduite de fluide sous pression (40, 34).
  10. Dispositif de superfinition selon l'une quelconque des revendications précédentes, caractérisé en ce que l'entraînement en oscillation (32) est un entraînement pneumatique sous la forme d'un vérin à simple ou double effet.
  11. Dispositif de superfinition selon l'une quelconque des revendications 2 ou 5 à 11, caractérisé en ce que le capteur d'accélération (50) est réalisé sous la forme d'un pendule à inertie, dont la force est mesurée à l'aide de ressorts, de vaporisation de carbone, par mesure d'induction ou de capacité, ou par effet piézo-électrique.
EP89111223A 1988-06-21 1989-06-20 Dispositif d'usinage fin automatique et sans centre pour éléments à surface de révolution symétrique dans une machine fonctionnant en continu Expired - Lifetime EP0347847B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8807980U DE8807980U1 (de) 1988-06-21 1988-06-21 Automatische spitzenlose Feinstbearbeitungsvorrichtung für Oberflächen rotationssymmetrischer Körper in einer Durchlaufmaschine
DE8807980U 1988-06-21
DE8812160U 1988-09-26
DE8812160U DE8812160U1 (de) 1988-09-26 1988-09-26 Automatische spitzenlose Feinstbearbeitungsvorrichtung für oberflächenrotationssymmetrische Körper in einer Durchlaufmaschine

Publications (3)

Publication Number Publication Date
EP0347847A2 EP0347847A2 (fr) 1989-12-27
EP0347847A3 EP0347847A3 (en) 1990-12-05
EP0347847B1 true EP0347847B1 (fr) 1993-09-15

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EP89111223A Expired - Lifetime EP0347847B1 (fr) 1988-06-21 1989-06-20 Dispositif d'usinage fin automatique et sans centre pour éléments à surface de révolution symétrique dans une machine fonctionnant en continu

Country Status (3)

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US (1) US5060423A (fr)
EP (1) EP0347847B1 (fr)
DE (1) DE58905593D1 (fr)

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ITUD20040101A1 (it) * 2004-05-17 2004-08-17 Delle Vedove Levigatrici Spa Macchina per rifinire un oggetto quale un profilato, un pannello, o simile
EP2404703B1 (fr) * 2010-07-05 2013-02-13 Supfina Grieshaber GmbH & Co. KG Dispositif et procédé de traitement précis de pièces à fabriquer
DE202011101113U1 (de) * 2011-05-26 2012-08-28 Supfina Grieshaber Gmbh & Co. Kg Werkstücktransporteinrichtung
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Also Published As

Publication number Publication date
EP0347847A2 (fr) 1989-12-27
EP0347847A3 (en) 1990-12-05
DE58905593D1 (de) 1993-10-21
US5060423A (en) 1991-10-29

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